the useful power out of an electric motor is 20w and the total power into the motor is 80w calculate the percentage efficiency of the motor

a 200 kg bucket of cement is accelerated 2200n. the acceleration continues for 5s, what is the power at the end of the period?

What is the mass of 5.4 moles of copper?

2/25/20 or 2/28/20 Dispatch #53 How much power is required to carry a 35 N package a vertical distance of 18 m if the work on the package is accomplished in 30 s? Students, we you feel

What is the total energy of a 850 kg sea plane flying at 38 m/s and 20 m above the ocean?

What are 5 crystalline solids

Both artists and scientists contribute to our understanding of the world around us. Identify the ways that art and science are similar. Check all that apply.

An automobile accelerates from rest at 1 + 3 * sqrt (t) mph/sec for 9 seconds. how far does it travel in those 9 sec?

A glass lens, n glass = 1.52, has a 131 nm thick antireflective film coating one side, n film = 1.25. White light, moving through the air, is perpendicularly incident on the coated side of the lens.

An automobile steering wheel is shown. The ideal mechanical advantage of this wheel and axle is. If a driver must exert a force of 2 N to overcome an axle resistance of 16 N, the AMA of the steering wheel is and its efficiency is__ %.?

How does the law of conservation of energy apply to machines? -Machines create energy from scratch. -Machines consume energy until no energy remains. -Energy transferred to a machine equals energy transferred from it.